Make adults use child items, like with Childish trait

In the middle of working on a trait (Sims4Studio & Zerbu), and I want to add to a subtrait that allows the possibility of using child items when your an adult. Similar to how the childish trait works. I have tried adding the 12661 Buff_Trait_Childish to the core buffs of the sub trait. Created a new core buff with 29125 commodity_Trait_Autonomy_Childish. Tried attaching it to an occasional event buff instead with 16830 Childish trait added to it. And nothing I seem to do is making it possible for my sim to interact with toys. (I tried a bunch of things including messing around with the child and adult traits too).

What am I missing? (I tried looking up the xml or package for Childish for reference, but can’t find a copy to look at.)
Do I need to go as far as adding snippets to create the individual interaction with the objects?


I’m still really new at this. Any help is appreciated.